Better spam filters. Easier to block all the crazy people. Easier to hand over basic filtering to unpaid interns who dont yet have government logins/email accounts.
This is a collaboration and international labor of love, with people hailing from Australia, England, and Canada. Go visit nasa.gov at top-level and see how the design changes, and the NASA logos are used.
These pages carry the Apollo insignias, and "last modified: November 2017".